time.clock has been deprecated since Python 3.3 and removed in 3.8

[dhomeier]

Thus from time import clock in floatcanvas fails as of Python 3.8b1.
Canonical fix would be to change it to from time import perf_counter as clock (or process_time, for best measurement of either total elapsed system time or the current Python process, respectively) or simply replace the clock() calls with either of the substitutes throughout.

[RobinD42]

This was fixed in 59e70e7